Sharpie black permanent markers... a must in your design tool kit

Don't leave home without one!
If you have black wood furniture, you must own this marker!
After repeatedly banging the vacuum against the wood couch legs, give it a spiffy touchup with your black sharpie. Since nobody's studying your couch legs from the floor (hmm... I hope they aren't!) you won't see any subtle differences in finish and can cover some serious damage this way.
Stay tuned for some other colors...